The idea behind BSlogger is to provide an elementary logging class for C++ projects that don't need any advanced logging features.
BSlogger is:
- header only
- single class
- very low overhead
BSlogger supports:
- colored output
- time and snapshot logging
- several log levels, log level control
- automatic function info
Basically all the features are shown in bslogger_examples.cpp
LOG_INIT_CERR();
// Log some stuff. The initial loglevel is
// INFO and lower (INFO, WARNING, ERROR)
// so the debug info is not displayed
log(LOG_DEBUG) << "Some text\n";
log(LOG_INFO) << "Some text\n";
log(LOG_WARN) << "Some text\n";
log(LOG_ERR) << "Some text\n";
// Change the log level
log.set_log_level(LOG_DEBUG);
// Now the debug info is displayed
log(LOG_DEBUG) << "Some text\n";
// Everything that has a operator<< method
// for ostreams can be logged
float x = 3.1415;
log(LOG_DEBUG) << "The value of x is " << x
<< ", the address is " << &x
<< '\n';
// You can add time snapshots
log.add_snapshot("before_sleep");
std::this_thread::sleep_for(std::chrono::milliseconds(2000));
// Log the time since the last snap added
log.time_since_last_snap();
// Log the time since a particular snap was added
log.time_since_snap("before_sleep");
// Log the time since the log was initialized
log.time_since_start();
Output:
[ INFO ][ 2017-02-08T20:04:47 ][ int main(int, char**) ]: Some text
[ WARNING ][ 2017-02-08T20:04:47 ][ int main(int, char**) ]: Some text
[ ERROR ][ 2017-02-08T20:04:47 ][ int main(int, char**) ]: Some text
[ DEBUG ][ 2017-02-08T20:04:47 ][ int main(int, char**) ]: Some text
[ DEBUG ][ 2017-02-08T20:04:47 ][ int main(int, char**) ]: The value of x is 3.1415, the address is 0x7fff17d6f1d8
[ TIME ][ 2017-02-08T20:04:47 ][ int main(int, char**) ]: Added snap 'before_sleep'
[ TIME ][ 2017-02-08T20:04:49 ][ int main(int, char**) ]: 2s since snap 'before_sleep'
[ TIME ][ 2017-02-08T20:04:49 ][ int main(int, char**) ]: 2s since snap 'before_sleep'
[ TIME ][ 2017-02-08T20:04:49 ][ int main(int, char**) ]: 2s since instantiation
The macros LOG_INIT_COUT(), LOG_INIT_CERR() and LOG_INIT_CLOG() are shorthands for logger log(std::cout, __PRETTY_FUNCTION__), logger log(std::cerr, __PRETTY_FUNCTION__) and logger log(std::clog, __PRETTY_FUNCTION__). Any std::ostream can be passed to the logger() constructor. The two constructors are:
logger(std::ostream&, std::string)- contructs a BSlogger logging toostreamand presenting the supplied string as the namespace.logger(std::ostream&, unsigned, std::string)- construcs a BSlogger using a non default log-level, otherwise same as above.
The log levels are:
LOG_SILENTLOG_ERRLOG_WARNLOG_INFOLOG_TIMELOG_DEBUG
The logger will print all messages with the current level and lower. The default log-level is LOG_TIME, the log-level can be modified using the logger::set_log_level(unsigned) function.
The compiler definition -DBSLOG_NO_COLORS will turn off colored output.
If one wants to modify the colors, simply replace the BSLOG_* definitions in the header file.
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